function CheckUniqueString(act, uniqueString, typeID, callback) {
    $.ajax({
        url: act + "?uniqueString=" + uniqueString + "&typeID=" + typeID,
        type: 'POST',
        async: false,
        success: function (resp) {
            if (typeof (callback) != undefined) {
                callback(resp);
            }
        }
    });
}
